Which condition is characterized by nausea and vomiting during motion?

Motion sickness is a condition that arises when there is a conflict between the signals that the inner ear, eyes, and deeper body parts send to the brain regarding motion. When someone is in a moving vehicle, for example, the inner ear detects movement, but if the person is reading a book or looking at something stationary, the eyes may not perceive that same movement. This mismatch can lead to symptoms such as nausea, vomiting, dizziness, and sweating.

The other conditions listed do not specifically relate to nausea and vomiting triggered by motion. Bulimia involves episodes of binge eating followed by purging behaviors but does not relate to motion. Food poisoning results from consuming contaminated food, causing gastrointestinal upset but is not related to motion. Anorexia nervosa is characterized by an intense fear of gaining weight and severely restricted eating, which does not involve nausea or vomiting as a direct consequence of movement. Thus, the specific association of nausea and vomiting during motion clearly identifies motion sickness as the correct condition.